<template>
    <div>
        <!--面包屑导航区域-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!--卡片视图区域-->
        <el-card>

            <!--提示区-->
            <el-alert
                    title="添加商品信息"
                    type="info"
                    center show-icon :closable="false">
            </el-alert>

            <!--步骤条区域-->
            <!--active只接收数值类型-->
            <el-steps align-center :space="200" :active="activeIndex-0" finish-status="success">
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <el-form label-position="top" :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                 <!--tab栏区域-->
                 <el-tabs
                         v-model="activeIndex"
                         :tab-position="'left'"
                         :before-leave="beforeTabLeave"
                         @tab-click="tabClicked">
                     <!--点击时name的值会赋值activeIndex-->
                     <el-tab-pane name="0" label="基本信息">
                         <!--label是标题名称 prop是校验规则-->
                         <el-form-item label="商品名称" prop="goods_name">
                             <el-input v-model="addForm.goods_name"></el-input>
                         </el-form-item>
                         <!--type="number" 只能输入数字-->
                         <el-form-item label="商品价格" prop="goods_price">
                             <el-input type="number" v-model="addForm.goods_price"></el-input>
                         </el-form-item>
                         <el-form-item label="商品重量" prop="goods_weight">
                             <el-input type="number" v-model="addForm.goods_weight"></el-input>
                         </el-form-item>
                         <el-form-item label="商品数量" prop="goods_number">
                             <el-input type="number" v-model="addForm.goods_number"></el-input>
                         </el-form-item>
                         <el-form-item label="商品分类" prop="goods_cat">
                             <el-cascader
                                     v-model="addForm.goods_cat"
                                     :options="cateList"
                                     expand-trigger="hover"
                                     :props="cateProps"
                                     @change="handleChange">

                             </el-cascader>
                         </el-form-item>
                     </el-tab-pane>
                     <el-tab-pane name="1" label="商品参数">
                         <!--渲染表单的item项-->
                         <el-form-item :key="item.attr_id" v-for="item in manyTableData" :label="item.attr_name">
                             <!--复选框组-->
                             <el-checkbox-group v-model="item.attr_vals">
                                 <el-checkbox border :key="i" :label="cb" v-for="(cb,i) in item.attr_vals"></el-checkbox>
                             </el-checkbox-group>
                         </el-form-item>
                     </el-tab-pane>
                     <el-tab-pane name="2" label="商品属性">
                         <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                         </el-form-item>
                     </el-tab-pane>
                     <el-tab-pane name="3" label="商品图片">
                         <!--
                           action 表示图片要上传到的后台api地址
                           on-preview图片预览事件
                           on-remove点击x移除事件
                           list-type 预览的样式
                           on-success图片上传成功的事件
                           -->
                         <el-upload
                                 :headers="headerObj"
                                 :action="uploadURL"
                                 :on-preview="handlePreview"
                                 :on-remove="handleRemove"
                                 list-type="picture"
                                 :on-success="handleSuccess">
                             <el-button size="small" type="primary">点击上传</el-button>
                         </el-upload>
                     </el-tab-pane>
                     <el-tab-pane name="4" label="商品内容">
                         <!--
                           富文本编辑器组件
                           所有编辑的内容在addForm.goods_introduce里面
                           -->
                         <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                         <!--添加商品的按钮-->
                         <el-button @click="add" class="btnAdd" type="primary">添加商品</el-button>
                     </el-tab-pane>
                 </el-tabs>
            </el-form>
        </el-card>

        <!--图片预览-->
        <el-dialog
                title="图片预览"
                :visible.sync="previewVisible"
                width="50%">
            <img class="previewImg" :src="previewPath"/>
        </el-dialog>

    </div>
</template>

<script>

   //深拷贝 lodash  npm i -save lodash \\全局安装
   //地址 https://www.lodashjs.com/

   import _ from "lodash"

   export default {
    name: "add",
    data(){
      return {
        activeIndex:0,
        //添加商品的表单数据对象
        addForm:{
          goods_name:"",
          goods_price:0,
          goods_weight:0,
          goods_number:0,
          //商品所属的分类数组
          goods_cat:[],
          //图片数组
          pics:[],
          //商品的详情描述
          goods_introduce:"",
          attrs:[]
        },
        addFormRules:{
          goods_name:[
            {
              required:true,message:"请输入商品名称",trigger:"blur"
            }
          ],
          goods_price:[
            {
              required:true,message:"请输入商品价格",trigger:"blur"
            }
          ],
          goods_weight:[
            {
              required:true,message:"请输入商品重量",trigger:"blur"
            }
          ],
          goods_number:[
            {
              required:true,message:"请输入商品数量",trigger:"blur"
            }
          ],
          goods_cat:[
            {
              required:true,message:"请输入商品分类",trigger:"blur"
            }
          ]
        },
        //商品分类列表
        cateList:[],
        cateProps:{
          label:"cat_name", //label是看到的哪些属性
          value:"cat_id", //选中的是谁的值
          children:"children" //children指的是用哪个属性来实现父子的嵌套
        },
        //动态参数列表数据
        manyTableData:[],
        //静态属性列表数据
        onlyTableData:[],
        //上传图片的URL地址
        uploadURL:"http://127.0.0.1:8888/api/private/v1/upload",
        //图片上传组件的headers请求头对象
        headerObj:{
          Authorization:window.sessionStorage.getItem("token")
        },
        previewPath:"",
        previewVisible:false
      }
    },
    created(){
      this.getCateList();
    },
    computed:{
      cateId(){
        if(this.addForm.goods_cat.length===3){
          return this.addForm.goods_cat[2];
        }

        return null;
      }
    },
    methods:{
      //获取所有商品分类数据
      async getCateList(){
        const cateListRes=await this.$http.get(`categories`);
        if(cateListRes.status!==200){
          return this.$message.error("获取商品分类数据失败！");
        }
        console.log("cateListRes:",cateListRes);
        this.cateList=cateListRes.data.data;
        console.log("cateList:",this.cateList);
      },
      //级联选择器选中项变化会触发这个函数
      handleChange(){
        console.log(this.addForm.goods_cat);
        if(this.addForm.goods_cat.length!==3){
          this.addForm.goods_cat=[];
        }
      },
      beforeTabLeave(activeName,oldActiveName){
        // console.log(`即将离开的标签页名字是：${oldActiveName}`);
        // console.log(`即将进入的标签页名字是：${activeName}`);

        if(oldActiveName==="0"&&this.addForm.goods_cat.length!==3){
            //不允许切换
            this.$message.error("请选择商品分类！");
            return false;
        }

      },
     async tabClicked(){
        console.log("activeIndex:",this.activeIndex);
        //证明访问的是动态参数面板
        if(this.activeIndex=="1"){
            console.log("动态参数面板！");
           const goodsParamsRes=await this.$http.get(`categories/${this.cateId}/attributes`,{
              params:{
                sel:"many"
              }
            });
           if(goodsParamsRes.status!==200){
              return this.$message.error("获取动态参数失败！");
           }
          console.log("goodsParamsRes:",goodsParamsRes);
          goodsParamsRes.data.data.forEach(item=>{
            item.attr_vals=item.attr_vals.length===0?[]:item.attr_vals.split(" ");
          });
          this.manyTableData = goodsParamsRes.data.data;
        }else if(this.activeIndex=="2"){

            const goodsInfo=await this.$http.get(`categories/${this.cateId}/attributes`,{
              params:{
                sel:"only"
              }
            });

            if(goodsInfo.status!==200){
              return this.$message.error("获取静态属性失败！");
            }
            console.log("goodsInfo:",goodsInfo);
            this.onlyTableData=goodsInfo.data.data;
        }
      },
      //处理图片预览的效果
      handlePreview(file){
        console.log("图片预览的file",file);
        this.previewPath=file.response.data.url;
        this.previewVisible=true;
      },
      //处理移除图片的操作
      handleRemove(file){
            console.log("file:",file);
            //1.获取将要删除的图片的临时路径
            const filePath=file.response.tmp_path;
            //2.从pics数组中找到这个图片的索引值 可以使用indexOf方法 也可以使用findIndex方法
            const picIndex=this.addForm.pics.indexOf(filePath);
            //3.调用数组的splice方法，把图片信息对象从pics数组中删除
            this.addForm.pics.splice(picIndex,1);
            console.log("addForm.pics:",this.addForm.pics);
      },
      //监听图片上传成功的事件
      handleSuccess(response){
        console.log("response:",response);
        //1.拼接得到一个图片信息对象
        const picInfo=response.data.tmp_path;
        //2.将图片信息对象push到pics数组中
        this.addForm.pics.push(picInfo);
        console.log("addForm.pics:",this.addForm.pics);
      },
      //添加商品
      add(){
        this.$refs.addFormRef.validate(async valid=>{
          if(!valid){
            return this.$message.error("请填写必要的表单项！");
          }
          //执行添加的业务逻辑
          //lodash的cloneDeep(obj)
          const form = _.cloneDeep(this.addForm);
          form.goods_cat=form.goods_cat.join(",");
          //处理动态参数
          this.manyTableData.forEach(item=>{
            const newInfo={
              attr_id:item.attr_id,
              attr_value:item.attr_vals.join(" ")
            };
            this.addForm.attrs.push(newInfo);
          });

          //处理静态属性
          this.onlyTableData.forEach(item=>{
            const newInfo={
              attr_id:item.attr_id,
              attr_value:item.attr_vals //静态属性attr_value值本来就是字符串
            }
            this.addForm.attrs.push(newInfo);
          });

          form.attrs=this.addForm.attrs;
          console.log("form:",form);

          //发起请求添加商品
          //商品名称必须是唯一的
          const addGoods=await this.$http.post("goods",form);
          if(addGoods.status!==200){
            return this.$message.error("添加商品失败！");
          }
          this.$message.success("添加商品成功！");
          this.$router.push("/goods");

        })
      }
    }
  }
</script>

<style lang="less" scoped>
   .el-checkbox{
       margin: 0 10px 0 0 !important;
   }

   .previewImg{
       display: block;
       width: 100%;
   }

   .btnAdd{
       margin-top: 15px;
   }

</style>